Dietary habits established in early childhood and maternal socioeconomic status (SES) are important, complex, interrelated factors that influence a child’s growth and development. The aim of this study was to define the major dietary patterns in a cohort of young US children, construct a maternal SES index, and evaluate their associations. | Dietary patterns of early childhood and maternal socioeconomic status in a unique prospective sample from a randomized controlled trial of Prenatal DHA Supplementation